Downhole Sand Level Device Using Signal Reflection
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Solution Overview
Problem
High sand concentrations in wellbores can lead to sand accumulation, causing unplanned remedial actions, equipment damage, and increased non-productive time due to the plugging of wellbores and tubing strings, which are not effectively addressed by conventional artificial lift systems.
Innovation Solution
A sand level device is integrated into the artificial lift system, which uses transmitters and receivers to detect sand accumulation by measuring the time duration of signals transmitted and reflected down the wellbore, sending alarms when the sand level reaches a predetermined threshold, allowing for timely remedial operations such as chemical treatments to dissolve the sand accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional artificial lift systems are used in wells with high sand concentrations, then fluid production can be maintained, but sand accumulation occurs in the wellbore leading to plug-ups and equipment damage
Solution Approach 1:
The sand level device continuously monitors the wellbore to detect sand accumulation at an early stage, before it causes plug-ups or equipment damage. This preliminary detection allows operators to take preventive actions such as adjusting production rates or implementing sand control measures, thereby maintaining both productivity and reliability.
Solution Approach 2:
The device provides real-time feedback on sand levels through continuous signal transmission and reception. The system monitors the time duration of signals reflected from the wellbore wall and compares it against predetermined thresholds, enabling dynamic adjustment of production operations to prevent sand-induced reliability issues.
2Reliability
If sand accumulation is allowed to build up to maximum levels, then remedial actions can be taken, but non-productive time increases due to unexpected workovers
Solution Approach 1:
By detecting sand accumulation early and providing advance warning before the sand level reaches critical thresholds, the system enables planned remedial actions rather than emergency workovers. This preliminary detection reduces non-productive time by allowing production to continue until the optimal moment for intervention.
Solution Approach 2:
The continuous feedback mechanism provides real-time sand level information, enabling operators to schedule remedial actions at convenient times rather than responding to unexpected plug-ups. This feedback loop transforms reactive maintenance into proactive scheduling, reducing downtime.
3Measurement precision
If the sand level device continuously monitors the wellbore, then early detection of sand encroachment is achieved, but device complexity increases
Solution Approach 1:
The system replaces complex mechanical sand level measurement methods with an acoustic or electromagnetic signal-based detection system. By using signal transmission and time-duration measurement, the device achieves precise sand level monitoring with relatively simple technology, avoiding the need for complex mechanical sensors or intrusive measurement mechanisms.
Solution Approach 2:
The sand level device utilizes the wellbore environment itself for measurement, employing the wellbore wall as a reflector and the existing production tubing as a signal transmission medium. This self-service approach eliminates the need for external monitoring equipment or complex installation structures, reducing overall system complexity while maintaining measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The sand level device enables early detection of sand encroachment, reduces non-productive time, and minimizes equipment damage by facilitating planned remedial actions, thereby improving operational efficiency and reducing costs associated with premature equipment failure and well plug-ups.
Implementation Method 1
one or more receivers to receive the at least two signals reflected from a reflecting surface in the wellbore
Implementation Method 2
A time duration of transmitting and receiving the at least two signals may correspond to a straight-line distance between the sand level device and the reflecting surface in the wellbore
Data Source
AI summary
A well site includes a wellbore extending from a surface to a target reservoir. A production tubing extends into the wellbore from the surface. The production tubing forms a flow conduit from the target reservoir to the surface. A pump is coupled to the production tubing to lift well fluids to the surface. A sand level device is coupled below the pump. The level device includes one or more transmitters to generate and transmit at least two signals down the wellbore and one or more receivers to receive the at least two signals reflected from a reflecting surface in the wellbore. A time duration of transmitting and receiving the at least two signals may correspond to a straight-line distance between the sand level device and the reflecting surface in the wellbore. The sand level device is configured to send an alarm when the straight-line distance does not surpass a predetermined threshold.